<template>
	<view class="searchLayout">
		<view class="search">
			<uni-search-bar @confirm="onSearch" @cancel="onClear" @clear="onClear" focus placeholder="搜索"
				v-model="queryParams.keyword" />
		</view>

		<view v-if="!classList.length">
			<view class="history" v-if="historySearch.length">
				<view class="topTitle">
					<view class="text">
						最近搜索
					</view>
					<view class="icon" @click="removeHistory">
						<uni-icons type="trash" size="25"></uni-icons>
					</view>
				</view>
				<view class="tabs">
					<view class="tab" v-for="tab in historySearch" :key="tab" @click="clickTab(tab)">
						{{tab}}
					</view>
				</view>
			</view>

			<view class="recommend" v-if="recommendList">
				<view class="topTitle">
					<view class="text">
						热门搜索
					</view>
				</view>
				<view class="tabs">
					<view class="tab" v-for="tab in recommendList" :key="tab" @click="clickTab(tab)">
						{{tab}}
					</view>
				</view>
			</view>
		</view>

		<view class="noSearch" v-if="noSearch">
			<uv-empty mode="car" icon="https://cdn.uviewui.com/uview/empty/car.png"></uv-empty>
		</view>

		<view v-else>
			<view class="list">
				<navigator :url="`/pages/preview/preview?id=${item._id}`" class="item" v-for="item in classList"
					:key="item._id">
					<image :src="item.smallPicurl" mode="aspectFill"></image>
				</navigator>
			</view>
			<view class="loadingLayout" v-if="noData || classList.length">
				<uni-load-more :status="noData?'noMore':'loading'"></uni-load-more>
			</view>
		</view>
	</view>
</template>

<script setup>
	import {
		onLoad,
		onUnload,
		onReachBottom
	} from "@dcloudio/uni-app"
	import {
		ref
	} from "vue";
	import {
		apiSearchData
	} from "@/api/apis.js"


	// 查询参数
	const queryParams = ref({
		pageNum: 1,
		pageSize: 12,
		keyword: ""
	})

	// 搜索历史词
	const historySearch = ref(uni.getStorageSync("historySearch") || []);

	// 热门搜索词
	const recommendList = ref(["美女", "帅哥", "宠物", "卡通"]);

	// 没有更多
	const noData = ref(false);

	// 没有搜索结果
	const noSearch = ref(false);

	// 搜索结果列表
	const classList = ref([])

	// 点击搜索
	const onSearch = () => {
		uni.showLoading();
		historySearch.value = [...new Set([queryParams.value.keyword, ...historySearch.value])].slice(0, 10);
		uni.setStorageSync("historySearch", historySearch.value);
		initParams(queryParams.value.keyword);
		searchData();
		console.log(queryParams.value.keyword);
	}

	// 点击清除按钮
	const onClear = () => {
		initParams();
	}

	// 点击标签进行搜索
	const clickTab = (value) => {
		initParams(value);
		onSearch();
	}

	// 点击清空搜索记录
	const removeHistory = () => {
		uni.showModal({
			title: "是否清空历史搜索？",
			success: (res) => {
				if (res.confirm) {
					uni.removeStorageSync("historySearch");
					historySearch.value = [];
					console.log("确认删除");
				}
			}
		})
	}

	// 获取搜索数据
	const searchData = async () => {
		try {
			let res = await apiSearchData(queryParams.value);
			classList.value = [...classList.value, ...res.data];
			uni.setStorageSync("storageClassList", classList.value)
			if (queryParams.value.pageSize > res.data.length) noData.value = true;
			if (res.data.length == 0 && classList.value.length == 0) noSearch.value = true;
			console.log(res);
		} catch (err) {
			//TODO handle the exception
			console.log(err);
		} finally {
			uni.hideLoading()
		}
	}

	// 初始化数据
	const initParams = (value = "") => {
		classList.value = [];
		noData.value = false;
		noSearch.value = false;
		queryParams.value = {
			pageNum: 1,
			pageSize: 12,
			keyword: value || ""
		}
	}

	// 触底加载更多
	onReachBottom(() => {
		if (noData.value) return;
		queryParams.value.pageNum++;
		searchData();
	})

	// 关闭页面
	onUnload(() => {
		uni.removeStorageSync("storageClassList");
	})
</script>

<style lang="scss" scoped>
	.searchLayout {
		.search {
			padding: 0 10rpx;
		}

		.topTitle {
			display: flex;
			justify-content: space-between;
			align-items: center;
			font-size: 32rpx;
			color: #999;
		}

		.history {
			padding: 30rpx;
		}

		.recommend {
			padding: 30rpx;
		}

		.tabs {
			display: flex;
			align-items: center;
			flex-wrap: wrap;
			padding-top: 20rpx;

			.tab {
				background: #F4F4F4;
				font-size: 28rpx;
				color: #333;
				padding: 10rpx 28rpx;
				border-radius: 50rpx;
				margin-right: 20rpx;
				margin-top: 20rpx;
			}
		}

		.list {
			display: grid;
			grid-template-columns: repeat(3,1fr);
			gap: 5rpx;
			padding: 20rpx 5rpx;
			.item{
				height: 440rpx;
				image{
					width: 100%;
					height: 100%;
					display: block;
				}
			}
		}
	}
</style>